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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.schema.expressiontransforms;

import com.yahoo.searchlib.rankingexpression.rule.CompositeNode;
import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;

/**
 * Replaces instances of the tensorflow(model-path, signature, output)
 * pseudofeature with the native Vespa ranking expression implementing
 * the same computation.
 *
 * @author bratseth
 */
public class TensorFlowFeatureConverter extends ExpressionTransformer  {

    public TensorFlowFeatureConverter() {}

    @Override
    public ExpressionNode transform(ExpressionNode node, RankProfileTransformContext context) {
        if (node instanceof ReferenceNode)
            return transformFeature((ReferenceNode) node, context);
        else if (node instanceof CompositeNode)
            return super.transformChildren((CompositeNode) node, context);
        else
            return node;
    }

    private ExpressionNode transformFeature(ReferenceNode feature, RankProfileTransformContext context) {
        if ( ! feature.getName().equals("tensorflow")) {
            return feature;
        }
        throw new IllegalArgumentException("Import of TensorFlow models is no longer supported");
    }

}